Perpetual calendar calculator



FIG. 1 is a front elevational view of the perpetual calendar calculator of the present invention;

FIG. 2 is a rear elevational view of the perpetual calendar calculator of FIG. 1;

FIG. 3 is a left side elevational view of the perpetual calendar calculator of FIG. 1;

FIG. 4 is a right side elevational view of the perpetual calendar calculator of FIG. 1;

FIG. 5 is a top plan view of the perpetual calendar calculator of FIG. 1; and,

FIG. 6 is a bottom plan view of the perpetual calendar calculator of FIG. 1. 

The ornamental design for a perpetual calendar calculator, as shown and described. 